Can be found here: https://jaysc.github.io/discord-datetime/
A very simple static page to help convert a date-time to the corresponding discord string.
I expect discord will implement the full feature within the app in the future.
Use <t:TIMESTAMP:FLAG>
to send it
Available flags:
t: Short time (e.g 9:41 PM)
T: Long Time (e.g. 9:41:30 PM)
d: Short Date (e.g. 30/06/2021)
D: Long Date (e.g. 30 June 2021)
f (default): Short Date/Time (e.g. 30 June 2021 9:41 PM)
F: Long Date/Time (e.g. Wednesday, June, 30, 2021 9:41 PM)
R: Relative Time (e.g. 2 months ago, in an hour)
Source: Reddit